-electric aeg lamp



(No Model.) ,3 Sheets-Sheet 1.

E. P. WARNER & A. J. OEHRING. ELBGTRIG ARC LAMP.

No. 591,182. Patented Oct. 5,1897.

(No Model.)

3 Sheets-Sheet 2. E. P. WARNER'8z A. J. OEHRING.

ELECTRIC ARC LAMP.

Patented Oct. 5,1897.

(No Model.) 1 3 Sheets-Sheet a.

E. P. WARNER 8a A. J. OEHRVING, ELECTRIC ARC LAMP.

No. 591,182. Patented 0%. 5,1897.

r l H 70 W I K l g E E Z 6011; Enga ed flaw warns,

UNITED A STATES 'ATENT CF ICE.

ERNEST P. WARNER AND AUGUST J. OEHRING, OF CHICAGO, ILLINOIS, ASSIGNORS TO THE WVESTERN ELECTRIC COMPANY, OF SAME PLACE.

ELECTRIC-ARC LAM P.

SPECIFICATION forming part of Letters Patent No. 591,182, dated October 5, 1897.

Application filed August 10, 1896. Serial No. 602,286. (No model.)

. 58 and 14,) of which the following is a full,

clear, concise, and exact description, reference being had to the accompanying drawings, forming a part of this specification.

Our invention relates to improvements in ribbon-feed arc-lamps, the object thereof being to provide a simple and effective feeding device for the carbon-holder thereof, in combination with means actuated by the said feeding device for controlling the lamp-circuits and for securing the accurate adjustment of the arc.

The improvements set forth in the present application may be briefly described as consisting of an arc-lamp provided with an adjustable carbon-holder suspended from the end of a flexible conducting-ribbon which passes over a pulley, the other end thereof carrying a weight adapted to maintain the ribbon taut. The supporting-ribbon is en-. gaged by a clutch which is actuated by an electromagnet to secure the proper adjustment of the arc, and a switch is connected with the feeding mechanism which controls the lamp-circuits.

WVe will explain our invention more in detail by reference to the accompanying drawings, in which- Figure 1 is a view in elevation of an arclamp provided with our ribbon-feed device. Fig. 2 is a diagrammatic view of the lamp and feeding device. Fig. 3 is a plan view of the same. Fig. 4 shows in detail the ribbonclutch. Fig. 5 is a detail view of the magnet cut-out.

Like letters refer to like parts throughout the several figures. 1

The carbon-holder a is suspended by the flexible copper ribbon b which passes over .the pulley c, journaled in the frame j. By

means of the weight cl, suspended by the ribbon in well d, the weight of the carbonholder is partially counterbalanced and the ribbon maintained taut. Ribbon-clutch e g, and conductor 0.

serves to adj ustably support the carbonholder at any required distance below the feeding device. The electromagnet g is connected in shunt with the arc, the armature g of which is secured to the arm 71 of bell-cran k h, which is pivoted in the frame j at h the lower end 71 being normally maintained in the position shown in Fig. 2 by means of the spring is bearing upon the screw is, by which the throw of the bell-crank h is adjusted. Pivoted to the other end 71, of the bell-crank is the lever m, which, by means of links m m is connected, respectively, with the frame j and the clutch c, whereby the said clutch is adapted to be operated by the electromagnet to release or engage the ribbon. Clutch 6 consists of two adjustable jaws e c, pivotally connected at their lower ends by the links 6 e which carry the ribbon-guides e 6 Links a e and e e 'are connected with the upper ends of the jaws and the links m by which the weight of the device and carbon-holder is normally supported, the links 6 e and e e thereby serving to firmly set the jaws of the clutch against the ribbon while sustaining this weight. When, however, the magnet g is energized, thereby depressing bell-crank h, lever m, link m and the ribbon-clutch until the latter rests upon the plate j, the links 6 e and e e are moved into a horizontal position, or one nearly so, and the jaws of the clutch are slightly opened, releasing the ribbon and permitting a downward movement of the carbon-holder and an adjustment of the arc.

The magnet g, which is of comparatively high resistance, is connected in shunt with the arc, as shown in Fig. 2, the current flow ing from conductor a, through wire p, contact-arm g, contact-spring r, wire 9 magnet When, by reason of the lengthening of the arc in a lamp employing the above device, more and more current flows through the magnet, thereby energizing the same, the force exerted by the spring 10 is sufficiently overcome to cause the clutch to be actuated, as explained above, to momentarily release the ribbon, permitting a downward adjustment of the carbon and carbonholder. The resistance now interposed between the carbons being decreased while the magnet offers a comparativelyhigh resistance to the current, the magnets become sufficiently deenergized to permit the spring L to act, causing the jaws of the clutch to close upon the ribbon, and the arc is maintained of proper length. 13y turning the screw 7n, the length of the are may be readily adjusted.

\Vhen the carbon-holder has reached its lowest position of adjustment, the weight (Z comes in contact with the extended end of contact-arm q, moving the said contact-arm into the position shown by the dotted lines in Fig. 5, in which position it engages with the insulation 0', carried upon the contact-spring '2', thereby cutting the magnet out of circuit. Upon the next downward movement of the weight, by reason of manual adjustment of the lamp or otherwise, the stud q, carried upon the weight, engages the contact-arm, throwing it back to its first position, thereby automatically reestablishing the shunt-circuit through the magnet.

Having thus described our invention, what we claim as new, and desire to secure by Letters Patent, is

1. In an are-lamp the combination with a flexible supporting-ribbon of a wheel or pulley, over which the ribbon passes, a vertieally-adjustable carbon-carrier, suspended from one end of said ribbon, a weight suspended from the other end of said ribbon, an electrically-operated clutch mechanism engaging the said ribbon, adapted to control its feeding movement and secure the adjustment of the same and means controlled by the movement of said ribbon for altering the circuits through the lamp, substantially as described.

2. In an arclamp, the combination with a vertically adjustable carbon carrier, of a flexible conducting-ribbon supporting at one end the said carbon-carrier, a wheel 0 r pulley over which the ribbon passes, a weight suspended from the other end oi? said ribbon adapted to maintain the same taut, a clutch device for controlling the vertical feed oi. the ribbon and CitlbOll-Cllfl'lC1., an electromagnct connected in shunt with the are adapted to actuate the said clutch, a spring opposing the said magnet adapted to separate the carbons and form the are, when the magnet is par tially deenergized, and means for adjusting the throw of the spring whereby the length of the arc is governed, substantially as de scribed.

In an arc-lamp, the combination with a flexible metallic ribbon I) passing over and supported by wheel or pulley c, of a carbon carrier a adjustably suspended within the lamp-frame from one end of the ribbon l), weight (Z suspended from the other end ol' said ribbon adapted to maintain the same taut, ribbon-clutch e controlling the feed and adjustment of the carbon-carrier, electromagnct 9 connected in shunt with the are, magnet-armature g connected with the said ribbon-clutch, whereby the same is actuated to engage or release the said ribbon and secure the carbon adjustment in the lamp, contactarm (1 controlling the circuit through the magnet and means controlled by the carbon adjustment for the operation thereof, substantially as and for the purpose described.

In witness whereof we hereunto SUbSCiibu our names this 18th day of March, A. D. lsim. 

